function showOverlay() { 
document.getElementById("overlay").style.visibility = "visible"; 
document.getElementById("content_overlay").style.visibility = "visible"; 
} 
function hideOverlay() { 
document.getElementById("overlay").style.visibility = "hidden"; 
document.getElementById("content_overlay").style.visibility = "hidden"; 
} 

function showOverlayNb() { 
document.getElementById("overlay").style.visibility = "visible"; 
document.getElementById("content_overlay_nb").style.visibility = "visible"; 
} 
function hideOverlayNb() { 
document.getElementById("overlay").style.visibility = "hidden"; 
document.getElementById("content_overlay_nb").style.visibility = "hidden"; 
} 

function showOverlayBe() { 
document.getElementById("overlay").style.visibility = "visible"; 
document.getElementById("content_overlay_be").style.visibility = "visible"; 
} 
function hideOverlayBe() { 
document.getElementById("overlay").style.visibility = "hidden"; 
document.getElementById("content_overlay_be").style.visibility = "hidden"; 
} 

function showOverlayFb() { 
document.getElementById("overlay").style.visibility = "visible"; 
document.getElementById("content_overlay_fb").style.visibility = "visible"; 
} 
function hideOverlayFb() { 
document.getElementById("overlay").style.visibility = "hidden"; 
document.getElementById("content_overlay_fb").style.visibility = "hidden"; 
} 

function showOverlayActive() { 
document.getElementById("overlay_active").style.visibility = "visible"; 
document.getElementById("content_overlay_active").style.visibility = "visible"; 
} 
function hideOverlayActive() { 
document.getElementById("overlay_active").style.visibility = "hidden"; 
document.getElementById("content_overlay_active").style.visibility = "hidden"; 
}